Purchased it new 05/28/2016 and now has almost 27,000 miles on it. Problems have been very few and minor. I have lost all faith in Cummins/Onan though.
I had generator issues from the start. Random shut off for no reason. They kept telling me I had a dirty fuel tank, no warranty. I spent over $600 with Cummins Atlantic and four 60 mile one way trips to get it serviced. The last time, I read that Onan had a service bulletin on the 5500W gas generators to replace the carburetor if they had a problem like mine. Remember the fuel pickup line is at a quarter tank so not to run coach out of gas. If the original diagnosis had been correct water is heavier than gasoline and settles to the bottom of the tank. I finally convinced them to replace the carburetor and I have not had a problem since. I tried to get Cummins to refund at least part of the money I paid. That fell on deaf ears.
Thor did not build the generator so I can't blame them. All-in-all I have a great motorhome that my wife and I enjoy.